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Merge tag 'irq-urgent-2022-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull irq fix from Thomas Gleixner:
 "A single fix for the interrupt affinity spreading logic to take into
  account that there can be an imbalance between present and possible
  CPUs, which causes already assigned bits to be overwritten"

* tag 'irq-urgent-2022-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq/affinity: Consider that CPUs on nodes can be unbalanced
This commit is contained in:
Linus Torvalds
2022-04-17 09:42:03 -07:00
parent 9a921a6ff7 08d835dff9
commit 7e1777f5ec
1 changed files with 3 additions and 2 deletions
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kernel/irq/affinity.c
+3 -2
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@@ -269,8 +269,9 @@ static int __irq_build_affinity_masks(unsigned int startvec,
*/
if (numvecs <= nodes) {
for_each_node_mask(n, nodemsk) {
cpumask_or(&masks[curvec].mask, &masks[curvec].mask,
node_to_cpumask[n]);
/* Ensure that only CPUs which are in both masks are set */
cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
cpumask_or(&masks[curvec].mask, &masks[curvec].mask, nmsk);
if (++curvec == last_affv)
curvec = firstvec;
}